I always get a tickle out of it when he does things like that because for being a little guy, he has a pretty good ear and I was rather surprised that he knew what it was (considering that everybody else was referring to it as a stand-up bass).
I asked him how he knew it and he said "Oh, we've played that in music class but the teacher calls it a contrabass" and in the most off-hand way and then in the same way said "That guy is pretty cool, bet lots of kids will want to play that now. He should win."
From the mouth of babes! I like Casey and Brett. I'm hoping against hope that they do not wear out their welcome by taking things too far. But so far so good.
I read an article about Casey's performance and evidently we were not the only family with this sort of discussion. That instrument caught the attention of a bunch of little kids who are now curious about it.